DIV layers and Z Index Troubles!

I’m fairly new to DreamWeaver and have come across problems with my Div layering.
The divs heading1,2,3 and column, column2, column3, all show up underneath all the other divs in my document.
It’s making any text and images gray and any hyperlinks not clickable. I’ve played around with the z-index of various divs but it doesn’t seem to fix the problem. Any help on this would be great, thanks!

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